gotosocial/internal/netutil/validate.go
Daniele Sluijters 558b448ab2
[chore] Remove duplicate prefixes from sanitizer (#1195)
In the previous changes that expanded the IPv4 and IPv6 deny lists based
on the IANA registries we inadvertently added a number of duplicates.
This is unnecessary as they're already caught by larger prefixes and
means there's less entries to scan.

This change removes all prefixes that are subnets of other prefixes.
2022-12-01 20:34:55 +01:00

103 lines
4 KiB
Go

/*
GoToSocial
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package netutil
import (
"net/netip"
)
var (
// IPv6Reserved contains IPv6 reserved IP prefixes.
// https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
IPv6Reserved = [...]netip.Prefix{
netip.MustParsePrefix("::1/128"), // Loopback
netip.MustParsePrefix("::/128"), // Unspecified address
netip.MustParsePrefix("::ffff:0:0/96"), // IPv4-mapped address
netip.MustParsePrefix("64:ff9b::/96"), // IPv4/IPv6 translation, RFC 6052
netip.MustParsePrefix("64:ff9b:1::/48"), // IPv4/IPv6 translation, RFC 8215
netip.MustParsePrefix("100::/64"), // Discard prefix, RFC 6666
netip.MustParsePrefix("2001::/23"), // IETF Protocol Assignments, RFC 2928
netip.MustParsePrefix("2001:db8::/32"), // Test, doc, examples
netip.MustParsePrefix("2002::/16"), // 6to4
netip.MustParsePrefix("2620:4f:8000::/48"), // Direct Delegation AS112 Service, RFC 7534
netip.MustParsePrefix("fc00::/7"), // Unique Local
netip.MustParsePrefix("fe80::/10"), // Link-local
netip.MustParsePrefix("fec0::/10"), // Site-local, deprecated
netip.MustParsePrefix("ff00::/8"), // Multicast
}
// IPv4Reserved contains IPv4 reserved IP prefixes.
// https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
IPv4Reserved = [...]netip.Prefix{
netip.MustParsePrefix("0.0.0.0/8"), // Current network
netip.MustParsePrefix("10.0.0.0/8"), // Private
netip.MustParsePrefix("100.64.0.0/10"), // RFC6598
netip.MustParsePrefix("127.0.0.0/8"), // Loopback
netip.MustParsePrefix("169.254.0.0/16"), // Link-local
netip.MustParsePrefix("172.16.0.0/12"), // Private
netip.MustParsePrefix("192.0.0.0/24"), // RFC6890
netip.MustParsePrefix("192.0.2.0/24"), // Test, doc, examples
netip.MustParsePrefix("192.31.196.0/24"), // AS112-v4, RFC 7535
netip.MustParsePrefix("192.52.193.0/24"), // AMT, RFC 7450
netip.MustParsePrefix("192.88.99.0/24"), // IPv6 to IPv4 relay
netip.MustParsePrefix("192.168.0.0/16"), // Private
netip.MustParsePrefix("192.175.48.0/24"), // Direct Delegation AS112 Service, RFC 7534
netip.MustParsePrefix("198.18.0.0/15"), // Benchmarking tests
netip.MustParsePrefix("198.51.100.0/24"), // Test, doc, examples
netip.MustParsePrefix("203.0.113.0/24"), // Test, doc, examples
netip.MustParsePrefix("224.0.0.0/4"), // Multicast
netip.MustParsePrefix("240.0.0.0/4"), // Reserved (includes broadcast / 255.255.255.255)
}
)
// ValidateAddr will parse a netip.AddrPort from string, and return the result of ValidateIP() on addr.
func ValidateAddr(s string) bool {
ipport, err := netip.ParseAddrPort(s)
if err != nil {
return false
}
return ValidateIP(ipport.Addr())
}
// ValidateIP returns whether IP is an IPv4/6 address in non-reserved, public ranges.
func ValidateIP(ip netip.Addr) bool {
switch {
// IPv4: check if IPv4 in reserved nets
case ip.Is4():
for _, reserved := range IPv4Reserved {
if reserved.Contains(ip) {
return false
}
}
return true
// IPv6: check if IP in IPv6 reserved nets
case ip.Is6():
for _, reserved := range IPv6Reserved {
if reserved.Contains(ip) {
return false
}
}
return true
// Assume malicious by default
default:
return false
}
}